docs: def clear_mode(self, mode, value=None):
          """Clear mode on the channel.
  
          Arguments:
  
              mode -- The mode (a single-character string).
  
              value -- Value
          """
          try:
              if mode in self.user_modes:
                  del self.mode_users[mode][value]
              else:
                  del self.modes[mode]
          except KeyError:
              pass